K-97 is a dry Altbier strain, similar to WY1007. I haven't tried them back-to-back, but they seem a bit different. They definitely are both strong top-croppers and are pretty sticky. Some people call it a "Koelsch" strain, but some people are wrong. It doesn't have the white fruit (pear/apple) and vinous esters you'd expect from a proper Koelsch yeast. K-97 is much closer to 1007 than to 2565. K-97 ferments cleanly and matures quickly. It's powdery, too, so it needs finings or extra time to drop bright.

K-97 is a dry Altbier strain, similar to WY1007. I haven't tried them back-to-back, but they seem a bit different. They definitely are both strong top-croppers and are pretty sticky. Some people call it a "Koelsch" strain, but some people are wrong. It doesn't have the white fruit (pear/apple) and vinous esters you'd expect from a proper Koelsch yeast. K-97 is much closer to 1007 than to 2565. K-97 ferments cleanly and matures quickly. It's powdery, too, so it needs finings or extra time to drop bright.

K-97 is a dry Altbier strain, similar to WY1007. I haven't tried them back-to-back, but they seem a bit different. They definitely are both strong top-croppers and are pretty sticky. Some people call it a "Koelsch" strain, but some people are wrong. It doesn't have the white fruit (pear/apple) and vinous esters you'd expect from a proper Koelsch yeast. K-97 is much closer to 1007 than to 2565. K-97 ferments cleanly and matures quickly. It's powdery, too, so it needs finings or extra time to drop bright.

It looks like other people picked up on the "citrus" thing going on there. There's also a discussion about what "typical" Koelsch flavor is. Some people were suggesting some Koelsch breweries use lager strains. Given the crisp and sulfury flavor of Reissdorf, that seems reasonable to me. I think a lot of what we consider "Koelsch" character gets lost in translation.

Anyway, I think K-97 works well with the kinds of hops I typically use (noble or tropical/citrus fruit, not resinous/piny.) IMO a West Coast IPA wouldn't be the best with K-97. I'd go with US-05 for that.